Function interp_set_generic 

fn interp_set_generic(
    args: &[RValue],
    named: &[(String, RValue)],
    context: &BuiltinContext<'_>,
) -> Result<RValue, RError>

Define an S4 generic function.

Registers the generic in the per-interpreter S4 generic registry and creates a dispatching function binding in the calling environment.

@param name character string naming the generic @param def default function definition @return the generic name (invisibly)